Grate.



No. 889,698. PATENTED JUNE 2, 1999.

' J. LEBS.

GRATB.

APPLICATION FILED 0CT.10,1 90'I.

JAMEs L-EEs, or'MoN rRiiAL, QUEBEQ, CANADA.

f sears. f j

. Speeificationof lietters rece t; I'l .Patented June 2, 190a. Application filed October 1051907. f-"S'erial1o. 396,825. r

T 0 all whom it may concern:

Be it known that l, Janus LEES, a subject of the King of Great Britain, residing at 155 Park avenue, in the city and district of Montreal, in the Province of Quebec, in the Do.

million of Canada, have invented certain new and useful Improvements in Grates, of which the following is a specification.

The invention relates to improvements in grates, as described in the present specification and illustrated in the accompanying drawings that form. part of the same.

.The invention consists essentially in the novel construction and arrangement of parts whereby the flow of air is directed to narrow crescent-shaped apertures from a comparatively wide space therehelow between neigh boring grate bars.

The objects of the invention are to increase the total area of the air inlet through said grate to the lire box and yet not widen the distance between bars and to increase the ve locity of the air flow.

In the drawings, Figure 1 is a plan view of the fuel surface of a portion of a grate. Fig. 2 is a plan view from the underside of a portion of the grate. Fig. 3 is across sectional view on the line A--B in Fig. 1. Fig. 4 is a perspective detail view'of a portion of a grate bar showing the recessed side. Fig. 5 is a perspective detail View of a portion of a grate bar showing the bossed side.

Like numerals of reference indicate corresponding parts in each figure.

It is known in the construction of grate bars to form them in corrugations longitudinally and also to arrange grate bars with half moon-shaped openings leading into a fire box, but it is not known, as far as I ain.

aware, to aoply an established. principle in the flow of 1 uids, that is increasing the velocity of the flow by narrowing the aperture through which. it escapes without reducing the total area, to the construction of grate bars and in this invention the lower end of the bosses represent the shoulder formed to wardly a short distance from the fuel surface and at their lower ends forming curved shoulders 4 merging into the plain surface 5 beneath the said hosscs on each. of said bars.

The bosses "l'are crescent-shaped in cross section, thehcrescentof the middle of said bosses in each fb ar being slightly elongated and flattened at 6. 7 are crescent-shaped recesses vertically arranged on the other side of each of said bars, the said recesses directly oppos-' ing corresponding bosses on the neighboring bar and forming a succession of narrow crescent-shaped apertures 8 leading into the fire box from the space below. The middle one of said recesses in each bar is flanked by the two walls 9 preferably meeting the flattened surfaces 6 of the middle ones. of the said bosses. The said recesses 7 extend downwardly from the fuel surfaces of each of said bars through. to the lower edge and form to all intents and ur oses a succession of vertical channels 10 ea ing to the apertures 8.

The general arrangen'ients of the grate bars and their supports may be much the same as p in the difierent forms of grates, the support- I ing frame not being shown in the accompany ing drawings.

The utility of this grate will be understood from the foregoing explanation, asit' has been explained that there is a principle involved in narrowing the outlet aperture from the wider mouth, and it will be seen from the description of the details of this invention,

that the wider mouth in each instance. is thelower end of the vertical channels 10, which. are narrowed near the aperture by the bosses 1, having the sloping shoulders 4 thus giving an impetus to the air leaving the aperture and greatly increasing the draft into the fire box.

What 1 claim. as my invention is:

1. In a grate, a plurality of parallel bars, each of said bars having continuous rows of vertical arc-shaped recesses extending fromv top to bottom in a side wall and bosses at the top of the other side wall of corresponding arc-shape in cross section and in continuous rows, said bosses havinga slight taper and inwardly inclined shoulders at their lower ends forming glancing walls in the air passages through said grate, substantially as describ ed.

2. In a grate, a lurality of parallel bars, aving a central vertical each of said bars groove forming an arc-shaped recess in one of its side walls, and fiat surfacesto each side of SttlLlIBCSS and a succession of vert1-' cal grooves in the same side wall between the upper edge of said flat surfaces and the ends the bar forming arc-shaped recesses extending from the bottom to the top of the bar, and a central fiat surfaced projection from the 11 per ortion of the reverse side wall of the ar a apted to engage the central flat surfaces of a neighboring bar, said rojeotion having an abruptly sloipingsho der at its lower end and a succession of bosses, arc-shaped in cross section, and having abruptly sloping shoulders at their lower end and extending from the upper portion of said reverse side of the bar between said central boss and the ends, said sloping shoulders forming glancing. Walls in the upward passage for the flow of air through said grate and said bars in arrangement forming an 15 upper and flush'fuel surface having-a succession of arc-shaped apertures between the center thereof and the ends of the bars.

Signed at the city and district of Montreal, in the Province of Quebec, in the Dominion 20 of Canada, this 3rd day of October, 1907.

AMES LEES,

Witnesses:

G. H. TRESIDDER, P. SHEE. 

